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How to make the LED automatically turn off with a countdown - MIT App Inventor Help - MIT App Inventor Community
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How to make the LED automatically turn off with a countdown - MIT App Inventor Help - MIT App Inventor Community
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8Pack Multi-Function Electronic Timer - Magnetic Digital Timers Big LCD Display The Loud / Silent Switch Countdown Timer Extensively Use in Break Time, Cooking,Gym, Meeting, Classroom - Walmart.com
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